After printing all the colors, it needs to be dried for 7-8 hours (natural drying). If it is urgently shipped, it can also use drying tunnel or dehumidifier for strong drying, so that the ink can reach the best adhesion, and then do the washing. When washing, prepare two large plastic buckets, followed by alkali, acid, and water. Be sure to control the ratio of alkali to water and the temperature of the water. Normally, 250g of alkali water is diluted with 40kg of clean water, and the temperature can be adjusted with boiling water to keep it at 50. Between -60 °C, first wash with two or three trials, generally about 10 minutes, under the action of alkali, the printing ink part is retained, no ink blanks become transparent polyester. At this point we will get the product graphics we need, then carefully observe the several test products to see if the ink is off, whether it is clean, the surface brightness is good, feel good, only large quantities into the water. During the washing process, if the speed is slow, the alkali concentration and the temperature of the water can be increased.
It is worth noting that the speed is a bit slower, but it is very safe, and the alkali must be in proper amount. If the concentration exceeds the limit, it may cause the printed pattern parts to be washed out. In practical operation, it should be used flexibly. When the washed paper is placed in acid water, the ratio of acid is 500g acid to 40-50kg water, which is a bit more. Then rinsing in clean water, although the surface looks very bright when the water rinsing out, but will leave a small bit of water marks after drying, affecting the appearance of the product, and finally changed to scrape off excess water with a scraper The method is to use a small table top with a layer of absorbent cloth, put the paper on it, scraper into an angle of 45 °, gently scratch it. Then put it back on the drying rack to dry it, polish it, die-cut, store it, and ship it.
Source: China Washing & Dyeing Industry Information Center
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